Miscellaneous Intelligence. 417 
morphs of pyrite after diatoms that had been posaicintg from the 
London clay, and explains their formation by first a coating of 
pyrite ae then a substitution of pyrite for the tina as it is 
slowly removed, molecule for molecule. By dissolving away the 
pyrite Ae patie ‘still a delicate siliceous skeleton remainin ng. 
. Report of the es Dr. C. V. Rizey, for the year 
1883; from the Report of the Department of Agriculture. 80 
pp with pla tes. pin 28 Ri iley’s report contains much important 
Information on insects injurious to vegetation, ot the best means 
of preventing their destructive work; and t e plates contain 
figure es of apparatus which bean toe for the latter 
purpose, besides illustrations of the insects, A valuable ee 
bee kar 
8. Resul e Dredging under A. Boast in_ the “ Blake.” 
ER.—T se 
Report on “the Isopoda, vy Oscar Harerr.—The species of 
Isopod Crustacea here described ne figured by Harger 
come from depths of 500 to 7,000 feet and are in as new to 
the American coast. They etuate. species of Cirolana, Aga, 
Rocinela and Syscenus. 
Exploration oy the Aigo’ Lal bess of the Gulf Stream ; 
by A. Agassiz. Vol. viii , No. 2 of the Memoirs of the Mus. 
ye Zool. Harvard Coleg 2 This memoir ue Aaa the Por- 
mp. 
2) consists chiefly of plates illustrating Comp, embryology 
Comatula, at eet Asteroids, Echinoids, and Holothurioids, 
48 made out by the res esearches of different zoologists. They 
are here bronghi together under the supervision of Mr, Agassiz, 
ao the aid of students in zoology, and make a very instructive 
ries, 
il, a of the Revenue Steamer Corwin in Alaska and the 
Ne “Bier ctie Ocean, in 1881. 120 pp. 4to, with many plates. 
ington, 18 1883. —This oes contains an illustrated memoir 
a ae Behring Sea and the Arctic Ocean, by E. W. 
NELson; Nera ological } Ehsan with plates, by Dr. Lo. Rosse; 
Botanical Notes, by Joun M 
IV. MiscetuANeous Screntiric INTELLIGENCE. 
1. National Academy of Sciences.—At the recent meeting of 
the National Academy, held at Washington from April 15th to 
2 the following papers were entered for reading: 
iene the 8 ate yg of the Transit of Venus taken at the Lick Observatory: by 
Whig ears is a minimum perooptible difference of sensation: by ©. S. 
Peirce and J. Jasrro 
The ataractir of the heat radiated from the soil: by S. P. LANGLEY 
in making a new photograph of the spectrum: by H. A. fowiaxn: 
